In Hall effect measurements a plate of width h = 10 mm and length l = 50 mm made of p-type semiconductor was placed in a magnetic field with induction B = 5.0 kG. A potential difference V = 10 V was applied across the edges of the plate. In this case the Hall field is VH = 50 mV and resistivity ρ= 2.5 Ω•cm. Find the concentration of holes and **** mobility.
We shall ignore ** carriers.**
Drifting holes experience a sideways force in the magnetic field and react by setting up a Hall electric field Ey to counterbalance it Thus
Substituting the data (note that in MKS units B = 5.0 k G = 0.5 T)
